This year’s flu season is proving to be worse than normal, with hospitalizations up significantly compared to last year, and the CDC reporting 4.6 million cases of the flu so far. But with peak flu season still going on until at least February, signs of the unusual “super flu” variant behind the rising sickness don’t seem to be slowing down anytime soon. The leading culprit? The latest version of the flu, subclade K, is a variant of the H3N2 influenza A virus that dominates flu seasons. This strain was responsible for over half of US flu cases as of mid-November.